/Engine/Source/Editor/Kismet/Public/BlueprintEditor.h
Called when a selection of nodes is being collapsed into a function
Returns TRUE if the selection can be promoted to a function
bool CanCollapseSelectionToFunction ( [TSet](API\Runtime\Core\Containers\TSet)< class [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) * > & InSelection ) const